Update travis.yml

Author: sharkdp

.travis.yml

@@ -1,15 +1,18 @@
 language: node_js
-sudo: false
-node_js:
-  - stable
+sudo: required
+dist: trusty
+node_js: stable
 env:
   - PATH=$HOME/purescript:$PATH
 install:
   - TAG=$(wget -q -O - https://github.com/purescript/purescript/releases/latest --server-response --max-redirect 0 2>&1 | sed -n -e 's/.*Location:.*tag\///p')
   - wget -O $HOME/purescript.tar.gz https://github.com/purescript/purescript/releases/download/$TAG/linux64.tar.gz
   - tar -xvf $HOME/purescript.tar.gz -C $HOME/
   - chmod a+x $HOME/purescript
-  - npm install bower
+  - npm install -g bower
   - npm install
 script:
-  - npm run build
+  - bower install --production
+  - npm run -s build
+  - bower install
+  - npm -s test